Section 179 and the 6,000-Pound Vehicle Deduction: Writing Off Equipment and Trucks

For trades and service businesses, vehicles and equipment are the biggest purchases of the year, and the tax code lets you deduct most of them immediately rather than over a decade. The “6,000-pound vehicle deduction” gets the attention, and it is real, but it is one piece of a larger system, and the details, weight class, business-use percentage, and recapture, are where owners either keep the deduction or hand part of it back.

Two Tools That Work Together

There are two ways to front-load deductions on business assets, and most owners use both.

Section 179 expensing. You elect to deduct the full cost of qualifying property in the year you place it in service. For 2025, the cap is $2.5 million, with a phase-out beginning once total purchases exceed $4 million. The key limit: Section 179 cannot create a loss. It is capped at your business’s taxable income.

Bonus depreciation. The 2025 tax law restored 100% bonus depreciation permanently for qualifying property placed in service after January 19, 2025. Unlike Section 179, bonus has no dollar cap and can create a loss.

With 100% bonus depreciation permanent again, a fair question is why Section 179 still matters at all. Three reasons:

Section 179 gives you precision. It is elected asset by asset, and you can take a partial amount on any single asset. If you want to deduct exactly enough to land in a lower bracket, or leave enough income on the table to absorb other deductions, Section 179 lets you dial in the number. Bonus depreciation is all or nothing by asset class: if you take it on one piece of five-year property, it applies to everything in that class placed in service that year.

States treat them differently. Many states do not follow federal bonus depreciation and require you to add it back. Florida’s corporate income tax, for example, decouples from bonus but generally conforms to Section 179. A Florida sole proprietor never notices (there is no state personal income tax), but for C corporations and owners filing in other states, the choice between the two changes the state bill.

They stack on the same asset, in a fixed order. You can absolutely use both on one vehicle: Section 179 is applied first, up to its cap, then bonus depreciation on the remaining basis, then regular MACRS depreciation on whatever is left. On a heavy SUV, that ordering used to be the whole strategy: Section 179 up to the SUV cap, bonus on the rest. Now that bonus is back at 100%, bonus alone will usually expense the entire vehicle, and the Section 179 layer only matters when you elect out of bonus.

The Vehicle Rules Turn on Weight

This is where most of the confusion lives. The deduction available on a vehicle depends almost entirely on its gross vehicle weight rating (GVWR), the number on the door-jamb sticker, and three tiers govern the result.

The tiers exist because of the luxury auto caps under Section 280F. Vehicles at or under 6,000 pounds GVWR are “passenger automobiles” in the eyes of the code, and passenger automobiles are subject to annual depreciation ceilings: roughly $20,000 in year one even with bonus depreciation, and smaller amounts each year after. A $90,000 luxury sedan takes more than a decade to fully depreciate under those caps. Vehicles over 6,000 pounds GVWR are excluded from the passenger-automobile definition entirely, which is why the caps simply vanish at that weight.

One note on a figure that circulates online: the SUV-specific Section 179 cap is indexed annually. It was $28,900 for 2023, $30,500 for 2024, and $31,300 for 2025. If you see $28,900 quoted, it is simply out of date.

The practical takeaway for a trades business: a work truck, cargo van, or qualifying pickup over 6,000 pounds GVWR, used predominantly for the business, can usually be deducted in full the year you buy it. You do not need to pay cash, either: a financed purchase is still a purchase, and the full cost is eligible even if you put little money down.

Which Vehicles Are Over 6,000 Pounds? A Working List

GVWR is the maximum loaded weight the manufacturer rates the vehicle for, not the curb weight you would see on a scale. That distinction is why many vehicles that feel mid-size still clear 6,000 pounds. The lists below cover common models by category, with approximate GVWR ranges across recent model years.

SUVs

Pickup trucks

Vans

The pickup-bed detail. A pickup over 6,000 pounds GVWR escapes the SUV cap entirely, meaning full Section 179 with no $31,300 limit, if its cargo bed is at least six feet of interior length and is not readily accessible from the passenger compartment. A crew cab with a 5.5-foot short bed is treated like an SUV: still free of the luxury-auto caps, but subject to the SUV cap on the Section 179 portion. Cargo vans with no seating behind the driver and a fully enclosed cargo area get the same full treatment as long-bed pickups.

The 50% Business-Use Gate

None of this works without business use. To claim Section 179 or bonus depreciation on a vehicle, business use must exceed 50% in the year you place it in service. If it does:

• You deduct the business-use percentage of the cost (an 80% business-use truck yields an 80% deduction)
• You must keep a mileage log substantiating the percentage

If business use is 50% or less, you lose Section 179 and bonus entirely and must use slower straight-line depreciation.

Calculating the percentage. Business-use percentage is business miles divided by total miles for the year. Business miles include driving to client sites and job sites, supplier and material runs, trips to the bank or post office for the business, and travel between business locations. They do not include commuting between home and a regular workplace, personal errands, or the school run. If you have a qualifying home office that is your principal place of business, trips from home to job sites count as business miles, which for many trades and service owners is the difference between 40% and 90% business use.

What the IRS expects. A contemporaneous mileage log: the date, destination, business purpose, and miles for each business trip, plus odometer readings at the start and end of the year to establish total miles. A phone app that tracks trips automatically satisfies this with almost no effort. What does not hold up is a log reconstructed in March from a calendar, which is the first thing an auditor challenges in a vehicle exam. Vehicle deductions are among the most frequently examined items on small business returns precisely because the documentation is so often missing.

The percentage you claim in year one also sets the deduction itself. Claim 90% business use on a $90,000 truck and deduct $81,000; if the real number was 60%, the deduction was overstated by $27,000, and the log is the only thing standing between you and that adjustment.

Selling Early or Slipping on Business Use: The Recapture Rules

The year-one write-off is not unconditional. Two events claw part of it back, and both are taxed as ordinary income, not capital gain.

If business use drops to 50% or below in a later year. This triggers Section 280F recapture. You recompute depreciation as if you had used slow straight-line depreciation from the beginning, and the excess you actually claimed comes back into income in the year of the drop (reported on Form 4797). Say you fully expensed an $80,000 truck in 2025, and in 2027 business use falls to 45%: the difference between the $80,000 you deducted and the modest straight-line amount you would have been allowed is added to 2027 income, and the vehicle depreciates straight-line from there.

If you sell or trade in the vehicle. A fully expensed vehicle has a tax basis of zero, so the sale price is nearly all gain, and under Section 1245 depreciation recapture, gain up to the total depreciation claimed is ordinary income. Fully expense a $70,000 truck, sell it three years later for $40,000, and roughly $40,000 (times the business-use percentage) lands on the return as ordinary income. Trade-ins no longer avoid this: since 2018, trading in a vehicle is treated as a sale, because like-kind exchanges are limited to real estate.

Sole Proprietor vs. S-Corp: The Entity Changes the Mechanics

The weight and business-use rules are the same everywhere, but who claims the deduction, and how, depends on the entity.

Sole proprietors and single-member LLCs. The simplest case. The vehicle can be titled in your own name, and you claim the deduction directly on Schedule C , choosing between the standard mileage rate and actual expenses with Section 179 or bonus. One catch: once you take Section 179 or bonus on a vehicle, you are locked into the actual-expense method for that vehicle and cannot switch to standard mileage later.

S corporation owners. Here the vehicle write-off has two workable setups and one broken one:

• The company owns the vehicle. The corporation buys, titles, and insures it, and claims Section 179 and bonus on the 1120-S. Your personal use of the vehicle becomes a taxable fringe benefit added to your W-2, valued under IRS tables. This is the route to the heavy-vehicle write-off inside an S-corp.
• You own the vehicle and the company reimburses you. The corporation cannot depreciate a vehicle it does not own, but it can reimburse your documented business mileage under an accountable plan . The reimbursement is deductible to the corporation and tax-free to you. This works well for moderate business mileage on a personal vehicle, but it will not capture the big year-one Section 179 or bonus deduction.
• The broken one: you own it, and nothing is set up. S-corp owners cannot deduct unreimbursed business expenses on their personal return (that deduction has been suspended since 2018), and the corporation cannot deduct a vehicle titled to you. With no accountable plan, the deduction is simply lost.

If the goal is the full heavy-vehicle deduction and you run an S-corp, the vehicle generally needs to be purchased and titled in the corporation’s name, with insurance to match.

Section 179 Is Limited by Income; Plan Accordingly

Because Section 179 cannot create a loss, timing matters. In a strong-profit year, a large equipment purchase plus Section 179 can wipe out a big chunk of taxable income. In a break-even year, Section 179 is capped at that low income, which is exactly when bonus depreciation (which can create a loss and carry forward) becomes the better tool. Coordinating the two against your actual profit is the planning move.

Common Mistakes That Undo the Deduction

Leasing and expecting Section 179. Only the owner of a vehicle can depreciate it. If you lease, you deduct the business-use share of the lease payments instead (with a small “income inclusion” add-back for expensive vehicles), and Section 179 and bonus are off the table. Leasing can still win on cash flow, but it is a different calculation, so decide the lease-versus-buy question with the tax treatment in view, not after the fact.

Counting the commute. Driving from home to your regular office, shop, or first job site of the day is commuting, and commuting is personal, no matter what tools are in the bed or what logo is wrapped on the doors. A vehicle wrap does not convert personal miles into business miles. The one genuine exception is a qualifying home office that serves as your principal place of business, which makes trips from home to work sites deductible business travel.

Title in the wrong name. A vehicle titled to you personally cannot be depreciated by your S-corp, and a vehicle titled to the business but insured personally invites both audit questions and coverage problems in an accident. Match the title, the insurance, and the deduction to the same taxpayer before year-end, not at tax time.

Bought in December, placed in service in January. The deduction lands in the year the vehicle is placed in service, ready and available for business use, not the year you sign the contract. A truck ordered December 20 and delivered January 8 is next year’s deduction. In a December tax-planning scramble, delivery timing matters as much as the purchase decision.

No mileage log. The most common failure is also the most preventable. Without contemporaneous records, an auditor can deny the vehicle deduction outright even when the business use was real. An app on your phone solves this for a few dollars a month.

Where It Fits in Your Broader Plan

For a profitable trades or service business, the vehicle and equipment deduction rarely stands alone. It pairs naturally with an S-corp election to cut self-employment tax, the QBI deduction on remaining profit, and the everyday small-business strategies like accountable plans and hiring family. Section 179 is often the single biggest lever, but the savings compound when it is part of a plan rather than a December scramble.

When to Seek Help

Buying a sub-6,000-pound car for occasional business use is simple, and limited. The value of advice shows up when you are making a large equipment or heavy-vehicle purchase, when you want to time it against a high-profit year, or when you are coordinating Section 179 with bonus depreciation to either maximize this year’s deduction or preserve a loss to carry forward. A short conversation before you buy, and before December 31, ensures the purchase lands in the right year, the weight class actually qualifies, and the deduction holds up if the IRS ever asks for the log.

Last updated: 2026